Crystals tabular {001}, with {110} lacking at times; prismatic by extension of [101] with large {111}; dipyramidal through combinations of {111} and {110}; prismatic [001] with large {110}. {001} and {111} often striated parallel to their intersection, and {111} may be rounded or step-like near the termination.

ⓘ - Click for further information on this occurrence.? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant.(TL) - Type Locality for a valid mineral species.(FRL) - First Recorded Locality for everything else (eg varieties).Struck out - Mineral was erroneously reported from this locality.Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.